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W78LE812P-24 Datasheet(PDF) 4 Page - Winbond

Part # W78LE812P-24
Description  8-BIT MTP MICROCONTROLLER
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W78LE812P-24 Datasheet(HTML) 4 Page - Winbond

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W78LE812
- 4 -
BLOCK DIAGRAM
P3.0
P3.7
P1.0
P1.7
ALU
Port 0
Latch
Port 1
Latch
Timer
1
Timer
0
Timer
2
Port
1
UART
XTAL1
PSEN
ALE
Vss
VCC
RST
XTAL2
Oscillator
Interrupt
PSW
Instruction
Decoder
&
Sequencer
Reset Block
Bus & Clock
Controller
SFR RAM
Address
Power control
256 bytes
RAM & SFR
Stack
Pointer
B
Addr. Reg.
Incrementor
PC
DPTR
Temp Reg.
T2
T1
ACC
Port 3
Latch
Port 4
Latch
Port
3
Port 2
Latch
P4.0
P4.6
Port
4
Port
0
Port
2
P2.0
P2.7
P0.0
P0.7
INT2~9
Watchdog
Timer
FUNCTIONAL DESCRIPTION
The W78LE812 architecture consists of a core controller surrounded by various registers, five general
purpose I/O ports, 256 bytes of RAM, three timer/counters, and a serial port. The processor supports
111 different opcodes and references both a 64K program address space and a 64K data storage
space.
Timers 0, 1, and 2
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,
TL1 and TH1 for Timer 1, TL2 and TH2 for Timer 2. The TCON and TMOD registers provide control
functions for timers 0 and 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2. The operations of Timer 0 and Timer 1
are the same as in the W78C51. Timer 2 is a special feature of the W78LE812: it is a 16-bit up/down
counter that is configured and controlled by the T2CON and T2MOD registers. Like Timers 0 and 1,
Timer 2 can operate as either an external event counter or as an internal timer, depending on the


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